Yum rollback : more issues

the discussions i have been involved in on the YUM mailing lists are still going on , and a very recent and important issue has cropped , consider if i have mysql installed in my system and i am upgrading to a higher version , now if i want to rollback then i would have to rollback to the previous version of the database server but not affect the databases and the data , so that would be a tough asking .
well a solution proposed for this was that if rollback was developed as a plugin or something for YUM , then it would during package installation warn the user that he is making changes that cannot be rolled back or may be the rollback utility will create a list of applications that cannot be rolled back and thus be excluded during rollback .
the final suggestion was that it was not a very good idea to actually implement the rollback utility as a part of yum or as an external module, that was quite disheartening , but looking at the issues there seems no other go , or is there one ??

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